CN210153776U - Combustion head and alcohol-based low-nitrogen combustion device - Google Patents

Abstract

The utility model discloses a combustion head and alcohol group low-nitrogen combustion device, the combustion head includes cylindric casing, be equipped with the fuel supply pipe who lays along the casing axial in the casing, establish the fuel nozzle unit in fuel supply pipe tip, the cylindric swirler of cover outside fuel supply pipe tip and the expansion section of laying and sealed intercommunication in proper order along the casing axial, central combustion chamber, undergauge section and oral area conic section, expansion section and oral area conic section are the conical cylinder structure, the throat end and the swirler of expansion section are connected, the throat end and the undergauge section of oral area conic section are connected, be equipped with cooling hole and electrode mounting hole in the expansion section, be equipped with a plurality of through-holes of circumferential distribution at the oral area conic section; the inner diameter of the reducing section is smaller than that of the central combustion chamber; the central combustion chamber is provided with a cooling hole, and the reducing section is provided with a plurality of groups of inclined through holes distributed in the circumferential direction. The utility model discloses an air classification forms low pressure RQL combustion chamber, and rich burning-quench-lean burning organizational structure reduces nitrogen oxide and discharges.

Description

Combustion head and alcohol-based low-nitrogen combustion device

Technical Field

The utility model belongs to the technical field of the boiler ignition burning, concretely relates to burning head and alcohol group low-nitrogen combustion apparatus.

Background

At present, China becomes the second largest petroleum consuming country in the world, the petroleum is greatly consumed by high-speed economic development, the oil price is continuously increased, the operating cost of the oil-fired boiler is more and more unbearable to users, and some users of the oil-fired boiler are searching for alternative fuels. The alcohol-based fuel is a clean and economic green and environment-friendly fuel, and many current factories which produce the alcohol-based fuel start oil-to-alcohol-based fuel projects. The technology of changing oil into alcohol-based fuel combustion becomes a new direction, an alcohol-based fuel burner becomes a key link of boiler ignition, and is also one of key equipment of a liquid fuel boiler, and the technical difficulty of changing the boiler ignition oil into the alcohol-based fuel is as follows: the alcohol-based fuel has low heat value and difficult ignition and combustion, which puts higher requirements on combustion organization structure; the combustion device has incomplete combustion, high emission of nitrogen oxides and serious pollution.

Disclosure of Invention

To the defect among the prior art with not enough, the utility model provides a burning head and alcohol group low-nitrogen combustion device overcomes current boiler afterbody flue gas nitrogen oxide and discharges defect not up to standard.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a burner head comprising a cylindrical housing, inside which are provided: the fuel nozzle unit comprises a fuel supply pipeline arranged along the axial direction of a shell, a fuel nozzle unit arranged in the end part of the fuel supply pipeline, a cylindrical swirler sleeved outside the end part of the fuel supply pipeline, an expansion section, a central combustion chamber, a reducing section and a mouth part conical section which are sequentially arranged along the axial direction of the shell and are communicated in a sealing way;

the expansion section and the mouth conical section are both in a conical cylindrical structure, the necking end of the expansion section is connected with the cyclone, the necking end of the mouth conical section is connected with the necking section, the expansion section is provided with a cooling hole and an electrode mounting hole, and the mouth conical section is provided with a plurality of through holes which are distributed circumferentially;

the central combustion chamber and the reducing section are both cylindrical structures, and the inner diameter of the reducing section is smaller than that of the central combustion chamber; the central combustion chamber is provided with a cooling hole, the reducing section is provided with a plurality of groups of inclined through holes distributed in the circumferential direction, and the included angle between each inclined through hole and the central axis of the reducing section is 30-60 degrees.

The utility model discloses still include following technical characteristic:

the fuel supply pipeline comprises a primary fuel supply pipeline and a secondary fuel supply pipeline coaxially sleeved outside the primary fuel supply pipeline; the fuel spray head unit comprises a swirler, an inner spray head coaxially sleeved outside the swirler, a tail end cover arranged at one end of the inner spray head and communicated with the primary fuel supply pipeline, and an outer spray head arranged between the outside of the other end of the inner spray head and the inner wall of the end part of the secondary fuel supply pipeline; the primary fuel supply pipeline, the tail end cover, the swirler and the inner nozzle are communicated to form a primary fuel channel; and the secondary fuel supply pipeline, the side wall of the outer nozzle and the annular gap between the inner nozzle and the outer nozzle are communicated to form a secondary fuel channel.

The cyclone comprises a cyclone outer cylinder, a cyclone inner cylinder and a plurality of spinning disks, wherein the cyclone inner cylinder is coaxial with the cyclone outer cylinder, the plurality of spinning disks are connected between the outer wall of the cyclone inner cylinder and the inner wall of the cyclone outer cylinder, and the plurality of spinning disks are distributed along the circumferential direction of the cyclone inner cylinder; the spiral-flow sheet is positioned at the end parts of the outer cylinder and the inner cylinder of the cyclone, and the inclination angle of the spiral-flow sheet is 25-35 degrees; the necking end of the expansion section is connected with the end part of the outer barrel of the swirler, so that the swirler, the primary fuel channel and the secondary fuel channel are respectively communicated with the expansion section; the end part of the inner wall of the inner cylinder of the swirler is provided with an annular secondary fuel supply pipeline limiting ring; the secondary fuel supply pipeline is tightly attached to the inner wall of the inner cylinder of the swirler, and the end face of the secondary fuel supply pipeline is clamped on the limiting ring of the secondary fuel supply pipeline, so that the secondary fuel supply pipeline is fixed.

The inner spray head comprises a cylindrical inner spray head nozzle, a conical inner spray head connecting section and a cylindrical inner spray head shell which are connected in sequence; an annular swirler limiting table is arranged on the inner wall of the inner sprayer connecting section; the tail end cover comprises a cylindrical tail end cover outer cylinder, a tail end cover inner cylinder which is coaxial with the tail end cover outer cylinder and is close to the end part of the tail end cover outer cylinder, and an annular end face which is connected with the tail end cover inner cylinder and the end part of the tail end cover outer cylinder; an annular primary fuel supply pipeline installation groove coaxial with the end cover inner cylinder is arranged on the annular end face; the outer spray head comprises a circular outer spray head end surface and an outer spray head barrel body which is coaxial with the outer spray head end surface; the side wall of the outer spray head barrel is provided with an outer spray head side through hole; the center of the end face of the outer spray head is provided with a conical groove, the tip of the conical groove is an outer spray head center hole which penetrates through the center of the end face of the outer spray head, and the diameter of the outer spray head center hole is larger than the outer diameter of the inner spray head nozzle; the secondary fuel supply pipeline, the side wall of the outer nozzle and the annular gap between the inner nozzle and the outer nozzle are communicated to form a secondary fuel channel.

The swirler, the inner spray head, the tail end cover and the outer spray head are all coaxially arranged, and the swirler is positioned in a cavity surrounded by the inner spray head shell; the end part of the inner spray head shell is in interference fit with an annular gap between the tail end cover inner cylinder and the tail end cover outer cylinder, the inner spray head nozzle is positioned in the outer spray head central hole, and the end surface of the inner spray head nozzle is flush with the end surface of the outer spray head; the outer spray head cylinder is fixedly sleeved at the end part of the outer cylinder of the tail end cover, so that the inner spray head is arranged between the end surface of the outer spray head and the annular end surface of the tail end cover; the end face of the primary fuel supply pipeline is fixed in a primary fuel supply pipeline mounting groove on the annular end face of the tail end cover;

one end of the primary fuel supply pipeline, which is far away from the fuel nozzle unit, is provided with a fuel joint, and the side wall of the secondary fuel supply pipeline is communicated with the fuel joint; the opening of the shell, which is close to the mouth part conical section, is a shell outlet end, and the opening of the shell, which is close to the fuel joint, is a shell connecting end; the shell connecting end is provided with a flange.

The distance between the outlet end of the shell and the conical section of the opening part is 0.5-1 time of the diameter of the shell; the wall thickness of the reducing section is 5 mm-15 mm; the aperture of the cooling hole is 1 mm-2.5 mm.

A plurality of arc-shaped mouth part supporting plates which are circumferentially distributed are arranged between the flaring end of the mouth part conical section and the inner wall of the shell, and the mouth part supporting plates, the mouth part conical section and the shell are welded; a support rod is arranged between the central combustion chamber and the shell, and the support rod is welded with the central combustion chamber and the shell; the mouth supporting plate and the supporting rod are used for fixing the integral structure formed by the expansion section, the central combustion chamber, the reducing section and the mouth conical section inside the shell.

The utility model also provides an alcohol-based low-nitrogen combustion device, which comprises an air supply system, a fuel supply system arranged at the air inlet of the air supply system and a program controller for controlling the air supply system and the fuel supply system; the air supply device is characterized by also comprising a combustion head, wherein the shell connecting end of the combustion head is hermetically communicated with an air outlet of the air supply system through a reducing pipeline.

Both ends of the reducing pipeline are respectively in detachable sealing communication with the shell connecting end of the combustion head and the air outlet of the air supply system through flanges; an ignition electrode is arranged on the electrode mounting hole of the expansion section; an ultraviolet fire detector is arranged at the joint of the reducing pipeline and the air outlet of the air supply system; the fuel connector is in sealed communication with a fuel supply system.

Compared with the prior art, the utility model, profitable technological effect is:

(I) the utility model discloses an air classification forms novel low pressure RQL combustion chamber, and rich burning-quench-lean burning organizational structure reduces nitrogen oxide.

(II) specifically, a novel rich burn-quench-lean burn (RQL) combustion organizational structure is adopted, and a rich burn area is arranged in an expansion section, a central combustion chamber and a cooling hole structure area; the fuel and the combustion-supporting air react in the rich combustion area under the environment of insufficient oxygen, so that the reaction deviates from the chemical reaction equivalence ratio, and the nitrogen oxide is reduced. The quenching area has reducing section position department, and the quenching area has a large amount of wind to get into the regional of burning high temperature, reduces reaction heat concentration district temperature, and nitrogen oxide generates speed greatly reduced below 1500K, restraines nitrogen oxide and generates. The lean burn area is located oral area conic section, oral area backup pad, casing outer wall position department, and the fuel of complete reaction and tertiary wind homogeneous mixing react and deviate from the chemical reaction equivalence ratio, restrain nitrogen oxide and finally generate, and the totality passes through the RQL combustion chamber, and nitrogen oxide yield greatly reduced reduces nitrogen oxide and discharges.

(III) the low-pressure combustion-supporting air of the utility model is classified for many times, and tests prove that the proper distribution proportion ensures that the low-pressure air and fuel react completely in three stages in the RQL combustion chamber, and the low-pressure combustion-supporting air reacts with the fuel in the environment deviating from the chemical equivalence ratio after being classified for three times, so that the generation of nitrogen oxides is inhibited for many times; the primary combustion-supporting air enters the central combustion chamber through the cyclone and the uniformly distributed annular gaps, the combustion-supporting air accelerated by the cyclone is fully mixed with fuel sprayed by the central nozzle, the ignition requirement is met, primary combustion is completed, and a rich combustion area is formed and enters the quenching area; the secondary combustion-supporting air passes through a plurality of small cooling holes on the outer wall of the central combustion chamber and a large hole with an angle at the reducing section to carry out the reaction of the cooling of the combustion chamber and the quenching zone; the tertiary air passes through a plurality of holes uniformly distributed on the circumference of the conical section of the mouth part to carry out afterburning reaction to form a lean combustion zone, so that the fire is stabilized at the mouth part of the burner, and simultaneously, the generation of a large amount of nitrogen oxides is inhibited.

(IV) the central combustion chamber of the utility model adopts two single electrodes for ignition, and is symmetrically arranged along the central axis, thereby ensuring the ignition stability and reliability; the burner adopts a mechanical atomization nozzle to realize flow adjustment; the double-cyclone mechanical atomization nozzle is adopted to realize the variable load adjustment of the combustor; the high-speed combustion of the fuel is realized by using low-pressure air, and the special requirements of combustion flame of a hearth are met.

Drawings

Fig. 1 is a sectional view of the overall structure of the burner head of the present invention.

Fig. 2 is a schematic structural diagram of a fuel injector unit according to the present invention.

Fig. 3(a) and (b) are schematic structural views of the vortex apparatus of the present invention.

Fig. 4(a) and (b) are schematic structural views of the inner nozzle of the present invention.

Fig. 5(a) and (b) are schematic structural views of the tail end cover of the present invention.

Fig. 6(a) and (b) are schematic structural views of the outer nozzle of the present invention.

Fig. 7 is a schematic structural diagram of a cyclone according to the present invention.

Fig. 8 is the overall structure schematic diagram of the alcohol-based low-nitrogen combustion device of the present invention.

Fig. 9 is a front view of the overall structure of the alcohol-based low-nitrogen combustion device of the present invention.

The reference numbers in the figure are 1-shell, 2-fuel supply pipe, 3-fuel nozzle unit, 4-swirler, 5-expanding section, 6-central combustion chamber, 7-reducing section, 8-mouth conical section, 9-mouth support plate and 10-support rod;

21-primary fuel supply conduit, 22-secondary fuel supply conduit, 23-fuel joint;

31-a swirler;

32-inner spray head, 321-inner spray head nozzle, 322-inner spray head connecting section, 323-inner spray head shell;

33-tail end cover, 331-tail end cover outer cylinder, 332-tail end cover inner cylinder, 333-primary fuel supply pipeline mounting groove;

34-outer nozzle, 341-outer nozzle end face, 342-outer nozzle barrel, 343-outer nozzle side through hole and 344-outer nozzle center hole;

41-swirler outer cylinder, 42-swirler inner cylinder, 43-swirl plate and 44-secondary fuel supply pipeline limiting ring;

51-cooling holes, 52-electrode mounting holes; 71-oblique through holes; 81-through holes;

100-an air supply system, 200-a fuel supply system, 300-a program controller, 400-a combustion head and 500-a reducing pipeline.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Example 1:

as shown in fig. 1 to 7, the present embodiment provides a burner head including a cylindrical housing 1, in which housing 1: the fuel nozzle comprises a fuel supply pipeline 2 arranged along the axial direction of a shell 1, a fuel nozzle unit 3 arranged in the end part of the fuel supply pipeline 2, a cylindrical swirler 4 sleeved outside the end part of the fuel supply pipeline 2, an expansion section 5, a central combustion chamber 6, a reducing section 7 and a mouth conical section 8 which are sequentially arranged along the axial direction of the shell 1 and are communicated in a sealing way; the expansion section 5 and the mouth conical section 8 are both in a conical cylindrical structure, the reducing end of the expansion section 5 is connected with the swirler 4, the reducing end of the mouth conical section 8 is connected with the reducing section 7, the expansion section 5 is provided with a cooling hole 51 and an electrode mounting hole 52, and the mouth conical section 8 is provided with a plurality of through holes 81 which are distributed circumferentially; the central combustion chamber 6 and the reducing section 7 are both cylindrical structures, and the inner diameter of the reducing section 7 is smaller than that of the central combustion chamber 6; the central combustion chamber 6 is provided with a cooling hole 51, and the cooling hole 51 on the central combustion chamber 6 is used as a cooling air inlet to protect the material of the central combustion chamber 6 from being burnt out; the reducing section 7 is provided with a plurality of groups of plurality of inclined through holes 71 distributed in the circumferential direction, the included angle between each inclined through hole 71 and the central axis of the reducing section 7 is 30-60 degrees, and the inclined through holes 71 play a role in guiding, so that air distribution enters the reducing section 7 from the inclined through holes 71 and flows towards the outlet direction, and the partition combustion is facilitated.

According to the technical scheme, a novel rich burn-quench-lean burn (RQL) combustion organizational structure is adopted, and a rich burn area is arranged in the structural areas of the expansion section 5, the central combustion chamber 6 and the cooling hole 51; the fuel and the combustion-supporting air react in the rich combustion area under the environment of insufficient oxygen, so that the reaction deviates from the chemical reaction equivalence ratio, and the nitrogen oxide is reduced. The quenching area has the position department of reducing section 7, and the quenching area has a large amount of wind to get into the regional of burning high temperature, reduces reaction heat concentration district temperature, and nitrogen oxide generates speed greatly reduced below 1500K, restraines nitrogen oxide and generates. The lean burn area is located oral area conic section 8, oral area backup pad 9, casing 1 outer wall position department, and the fuel that does not completely react is evenly mixed with tertiary air, and the reaction deviates from the chemical reaction equivalence ratio, and the final formation of nitrogen oxide is restrained, and the totality passes through the RQL combustion chamber, and nitrogen oxide formation volume greatly reduced reduces nitrogen oxide and discharges. The low-pressure combustion-supporting air is classified for many times, and the appropriate distribution proportion is verified through tests, so that the low-pressure air and the fuel are completely reacted in the three stages in the RQL combustion chamber; the primary combustion-supporting air enters the central combustion chamber through the cyclone and the uniformly distributed annular gaps, the combustion-supporting air accelerated by the cyclone is fully mixed with fuel sprayed by the central nozzle, the ignition requirement is met, primary combustion is completed, and a rich combustion area is formed and enters the quenching area; the secondary combustion-supporting air passes through a plurality of small cooling holes on the outer wall of the central combustion chamber and a large hole with an angle at the reducing section to carry out the reaction of the cooling of the combustion chamber and the quenching zone; the tertiary air passes through a plurality of holes uniformly distributed on the circumference of the conical section of the mouth part to carry out afterburning reaction to form a lean combustion zone, so that the fire is stabilized at the mouth part of the burner, and simultaneously, the generation of a large amount of nitrogen oxides is inhibited.

In the present embodiment, the fuel supply pipe 2 includes a primary fuel supply pipe 21 and a secondary fuel supply pipe 22 coaxially fitted outside the primary fuel supply pipe 21; the fuel spray head unit 3 comprises a swirler 31, an inner spray head 32 coaxially sleeved outside the swirler 31, a tail end cover 33 arranged at one end of the inner spray head 32 and communicated with the primary fuel supply pipeline 21, and an outer spray head 34 arranged between the outside of the other end of the inner spray head 32 and the inner wall of the end part of the secondary fuel supply pipeline 22; the primary fuel supply pipeline 21, the tail end cover 33, the swirler 31 and the inner spray head 32 are communicated with each other to form a primary fuel channel; secondary fuel supply conduit 22, the side wall of outer cup 34, and the annulus between inner cup 32 and outer cup 34 communicate and form a secondary fuel passage. The fuel nozzle unit 3 adopts a double-rotational flow mechanical atomization mode, fuel is supplied through a single channel, a large-range flow regulation function of mechanical atomization can be realized, liquid fuel is sprayed out through nozzles of two-stage fuel channels, three-stage flow automatic regulation can be realized through control, pressure is changed on the premise that atomization requirements are met, and a multi-flow regulation variation range is realized; the central primary fuel is sprayed out from the inner nozzle in the form of a swirler, the secondary fuel is sprayed out from the annular gap between the inner nozzle 32 and the outer nozzle 34 in the form of a mechanical spinning disk, the primary fuel and the secondary fuel form an independent supply pipeline, and the output pressure of the fuel pump is changed simultaneously through the combined action of an independent pipeline electromagnetic valve and a main pipeline electromagnetic valve, so that variable load adjustment is realized.

The swirler 4 comprises a swirler outer cylinder 41, a swirler inner cylinder 42 coaxially arranged with the swirler outer cylinder 41, and a plurality of swirl vanes 43 connected between the outer wall of the swirler inner cylinder 42 and the inner wall of the swirler outer cylinder 41, wherein the plurality of swirl vanes 43 are distributed along the circumferential direction of the swirler inner cylinder 42; the spinning disk 43 is positioned at the end parts of the cyclone outer cylinder 41 and the cyclone inner cylinder 42, and the inclination angle of the spinning disk 43 is 25-35 degrees; in the present embodiment, the swirling strength is a weak swirling. The necking end of the expansion section 5 is connected with the end part of the swirler outer cylinder 41, so that the swirler 4, the primary fuel channel and the secondary fuel channel are respectively communicated with the expansion section 5; an annular secondary fuel supply pipeline limiting ring 44 is arranged at the end part of the inner wall of the swirler inner cylinder 42; the secondary fuel supply pipe 22 is tightly attached to the inner wall of the swirler inner cylinder 42, and the end face of the secondary fuel supply pipe 22 is clamped on the secondary fuel supply pipe limiting ring 44, so that the secondary fuel supply pipe 22 is fixed.

The inner nozzle 32 comprises a cylindrical inner nozzle spout 321, a conical inner nozzle connecting section 322 and a cylindrical inner nozzle shell 323 which are connected in sequence; an annular swirler limiting table is arranged on the inner wall of the inner nozzle connecting section 322; the tail end cover 33 includes a cylindrical tail end cover outer cylinder 331, a tail end cover inner cylinder 332 coaxial with the tail end cover outer cylinder 331 and near an end of the tail end cover outer cylinder 331, and an annular end face connecting ends of the tail end cover inner cylinder 332 and the tail end cover outer cylinder 331; an annular primary fuel supply pipeline installation groove 333 which is coaxial with the end cover inner cylinder is arranged on the annular end surface; the outer spray head 34 includes a circular outer spray head end surface 341 and an outer spray head cylinder 342 coaxial with the outer spray head end surface 341; an outer nozzle side through hole 343 is formed in the side wall of the outer nozzle cylinder 342; the center of the end surface 341 of the outer nozzle is provided with a conical groove, the tip of the conical groove is an outer nozzle center hole 344 penetrating through the center of the end surface 341 of the outer nozzle, and the diameter of the outer nozzle center hole 344 is larger than the outer diameter of the inner nozzle 321; to provide communication and form a secondary fuel passage between secondary fuel supply conduit 22, the side wall of outer cup 34, and the annulus between inner cup 32 and outer cup 34.

The swirler 31, the inner spray head 32, the tail end cover 33 and the outer spray head 34 are coaxially arranged, and the swirler 31 is positioned in a cavity surrounded by the inner spray head shell 323; the end of the inner nozzle shell 323 is in interference fit with the annular gap between the tail end cover inner cylinder 332 and the tail end cover outer cylinder 331, the inner nozzle 321 is positioned in the outer nozzle central hole 344, and the end surface of the inner nozzle 321 is flush with the outer nozzle end surface 341; the outer nozzle cylinder 342 is fixedly sleeved on the end of the tail end cover outer cylinder 331, specifically, in this embodiment, the outer nozzle cylinder 342 is welded with the tail end cover outer cylinder 331, so that the inner nozzle 32 is disposed between the outer nozzle end surface 341 and the annular end surface of the tail end cover 33; the outer nozzle end surface 341 is fixed on the inner wall of the end of the primary fuel supply pipe 21 for a circle, and the end of the primary fuel supply pipe 21 is fixed in the primary fuel supply pipe installation groove 333 on the annular end surface of the tail end cover 33; one end of the primary fuel supply pipeline 21, which is far away from the fuel nozzle unit 3, is provided with a fuel joint 23, the side wall of the secondary fuel supply pipeline 22 is communicated with the fuel joint 23, and the fuel joint 23 is used for communicating with a fuel supply system; the opening of the shell 1 close to the mouth conical section 8 is a shell outlet end, and the opening of the shell 1 close to the fuel joint 23 is a shell connecting end; the shell connecting end is provided with a flange for fixedly connecting the combustion head with the pipeline.

The distance between the outlet end of the shell and the mouth conical section 8 is 0.5-1 time of the diameter of the shell 1;

the wall thickness of the reducing section 7 is 5 mm-15 mm; in other embodiments, the wall thickness of the reducing section 7 can be 0.5-1.5 times of the hole diameter of the inclined through hole 71, combustion-supporting air can form a quenching area through the hole with a certain wall thickness, the space of the reducing section 7 is smaller than that of the central combustion area, combustion formation is accelerated, combustion flame forms high-speed combustion at the outlet of the combustion head, the residence time of combustion reaction is shortened, and reduction of nitrogen oxides is facilitated.

The diameter of the cooling hole 51 is 1mm to 2.5 mm.

A plurality of arc mouth supporting plates 9 which are circumferentially distributed are arranged between the flared end of the mouth conical section 8 and the inner wall of the shell 1, and the mouth supporting plates 9, the mouth conical section 8 and the shell 1 are welded; in this embodiment, three to six arc-shaped annular gap grooves can be formed between the mouth support plates 9, so as to ensure complete combustion of the liquid fuel and ensure the safe operation of the combustion device.

A support rod 10 is arranged between the central combustion chamber 6 and the shell 1, and the support rod 10 is welded with the central combustion chamber 6 and the shell 1; the mouth supporting plate 9 and the supporting rod 10 are used for fixing the integral structure formed by the expansion section 5, the central combustion chamber 6, the reducing section 7 and the mouth conical section 8 inside the shell 1.

Example 2:

as shown in fig. 1 to 9, the present embodiment provides an alcohol-based low-nitrogen combustion apparatus, which includes an air supply system 100, a fuel supply system 200 disposed at an air inlet of the air supply system 100, and a program controller 300 for controlling the air supply system 100 and the fuel supply system 200; the air supply device further comprises the combustion head 400 in the embodiment 1, and the shell connecting end of the combustion head 400 is hermetically communicated with the air outlet of the air supply system 100 through the reducing pipeline 500.

Specifically, the two ends of the variable diameter pipeline 500 are respectively connected with the shell connecting end of the combustion head 400 and the air outlet of the air supply system 100 through flanges in a detachable and sealed mode, and the flange connection position is fixed by a plurality of screws uniformly distributed on the circumference. The outer diameter of the combustion head 400 can be butted with the fan interface of the rear-end air system 100 in any size through the reducing pipeline 500, and the application range of the combustion device is expanded.

In this embodiment, the program controller 300 is fixed right behind the fan of the air supply system 100 by four screws, and can also be remotely controlled by a signal line, and belongs to the general command of combustion operation, and controls the air supply system and the fuel system to automatically operate, and meanwhile, a terminal in butt joint with a field is reserved, so that a signal is ensured to enter the DCS, and one-key start and stop is realized.

An ignition electrode is provided on the electrode mounting hole 52 of the expanding section 5 for ignition.

An ultraviolet fire detector is arranged at the joint of the reducing pipeline 500 and the air outlet of the air supply system 100; fire is examined and is arranged perpendicularly in reducing pipeline 500 air intake one side, guarantees that fire and examines the permeable combustor head gap of probe, works as ignition electrode, and flame takes place for combustion center combustion chamber, but the very first time transmits two electrode signal to program controller simultaneously, guarantees the combustor steady operation.

The fuel connector 23 is in sealed communication with the fuel supply system 200 for supplying fuel.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (10)

1. Burner head comprising a cylindrical housing (1), characterized in that inside said housing (1) there are provided: the fuel nozzle comprises a fuel supply pipeline (2) which is axially arranged along a shell (1), a fuel nozzle unit (3) which is arranged in the end part of the fuel supply pipeline (2), a cylindrical swirler (4) which is sleeved outside the end part of the fuel supply pipeline (2), an expansion section (5), a central combustion chamber (6), a reducing section (7) and a mouth conical section (8) which are sequentially arranged along the axial direction of the shell (1) and are communicated in a sealing way;

the expansion section (5) and the mouth conical section (8) are both in a conical cylindrical structure, the reducing end of the expansion section (5) is connected with the swirler (4), the reducing end of the mouth conical section (8) is connected with the reducing section (7), the expansion section (5) is provided with a cooling hole (51) and an electrode mounting hole (52), and the mouth conical section (8) is provided with a plurality of through holes (81) which are distributed circumferentially;

the central combustion chamber (6) and the reducing section (7) are both cylindrical structures, and the inner diameter of the reducing section (7) is smaller than that of the central combustion chamber (6); the central combustion chamber (6) is provided with a cooling hole (51), the reducing section (7) is provided with a plurality of groups of a plurality of inclined through holes (71) distributed in the circumferential direction, and the included angle between each inclined through hole (71) and the central axis of the reducing section (7) is 30-60 degrees.

2. Burner head according to claim 1, wherein said fuel feed conduit (2) comprises a primary fuel feed conduit (21) and a secondary fuel feed conduit (22) coaxially nested outside the primary fuel feed conduit (21);

the fuel spray head unit (3) comprises a swirler (31), an inner spray head (32) coaxially sleeved outside the swirler (31), a tail end cover (33) arranged at one end of the inner spray head (32) and communicated with the primary fuel supply pipeline (21), and an outer spray head (34) arranged between the outside of the other end of the inner spray head (32) and the inner wall of the end part of the secondary fuel supply pipeline (22);

the primary fuel supply pipeline (21), the tail end cover (33), the swirler (31) and the inner nozzle (32) are communicated with each other to form a primary fuel channel; the secondary fuel supply pipeline (22), the side wall of the outer nozzle (34) and the annular space between the inner nozzle (32) and the outer nozzle (34) are communicated and form a secondary fuel channel.

3. The burner head according to claim 2, wherein the swirler (4) comprises a swirler outer cylinder (41), a swirler inner cylinder (42) arranged coaxially with the swirler outer cylinder (41), and a plurality of swirl vanes (43) connected between an outer wall of the swirler inner cylinder (42) and an inner wall of the swirler outer cylinder (41), the plurality of swirl vanes (43) being arranged along a circumferential direction of the swirler inner cylinder (42);

the swirl plates (43) are positioned at the end parts of the swirler outer cylinder (41) and the swirler inner cylinder (42), and the inclination angle of the swirl plates (43) is 25-35 degrees;

the reducing end of the expansion section (5) is connected with the end part of the swirler outer cylinder (41), so that the swirler (4), the primary fuel channel and the secondary fuel channel are respectively communicated with the expansion section (5);

an annular secondary fuel supply pipeline limiting ring (44) is arranged at the end part of the inner wall of the swirler inner cylinder (42); the secondary fuel supply pipeline (22) is tightly attached to the inner wall of the inner cylinder (42) of the swirler, the end face of the secondary fuel supply pipeline (22) is clamped on the limiting ring (44) of the secondary fuel supply pipeline, and the secondary fuel supply pipeline (22) is fixed.

4. The burner head according to claim 2, characterized in that the inner nozzle (32) comprises a cylindrical inner nozzle orifice (321), a conical inner nozzle connecting section (322) and a cylindrical inner nozzle shell (323) connected in sequence; an annular vortex device limiting table is arranged on the inner wall of the inner spray head connecting section (322);

the tail end cover (33) comprises a cylindrical tail end cover outer cylinder (331), a tail end cover inner cylinder (332) which is coaxial with the tail end cover outer cylinder (331) and close to the end part of the tail end cover outer cylinder (331), and an annular end face which is used for connecting the tail end cover inner cylinder (332) and the end part of the tail end cover outer cylinder (331); an annular primary fuel supply pipeline installation groove (333) coaxial with the end cover inner cylinder is arranged on the annular end surface;

the outer spray head (34) comprises a circular outer spray head end surface (341) and an outer spray head cylinder body (342) which is coaxial with the outer spray head end surface (341); an outer spray head side through hole (343) is formed in the side wall of the outer spray head cylinder (342); the center of the outer nozzle end face (341) is provided with a conical groove, the tip part of the conical groove is an outer nozzle center hole (344) penetrating through the center of the outer nozzle end face (341), and the diameter of the outer nozzle center hole (344) is larger than the outer diameter of the inner nozzle (321); the secondary fuel supply pipeline (22), the side wall of the outer nozzle (34) and the annular space between the inner nozzle (32) and the outer nozzle (34) are communicated and form a secondary fuel channel.

5. The burner head according to claim 4, characterized in that the swirler (31), the inner burner (32), the tail end cap (33) and the outer burner (34) are coaxially arranged, the swirler (31) being located in a cavity enclosed by the inner burner housing (323);

the end part of the inner spray head shell (323) is in interference fit with an annular gap between the tail end cover inner cylinder (332) and the tail end cover outer cylinder (331), the inner spray head nozzle (321) is positioned in the outer spray head central hole (344), and the end surface of the inner spray head nozzle (321) is flush with the end surface (341) of the outer spray head;

the outer spray nozzle cylinder (342) is fixedly sleeved at the end part of the tail end cover outer cylinder (331), so that the inner spray nozzle (32) is arranged between the outer spray nozzle end surface (341) and the annular end surface of the tail end cover (33);

the outer nozzle end face (341) is fixed on the inner wall of the end part of the primary fuel supply pipeline (21) in a circle, and the end part of the primary fuel supply pipeline (21) is fixed in a primary fuel supply pipeline mounting groove (333) on the annular end face of the tail end cover (33).

6. The burner head according to claim 2, characterized in that the end of the primary fuel supply conduit (21) remote from the fuel injector unit (3) is provided with a fuel connector (23), and the side wall of the secondary fuel supply conduit (22) is connected with the fuel connector (23);

an opening of the shell (1) close to the mouth conical section (8) is a shell outlet end, and an opening of the shell (1) close to the fuel joint (23) is a shell connecting end; the shell connecting end is provided with a flange.

7. The burner head according to claim 1, characterized in that the distance between the outlet end of the housing and the mouth cone (8) is 0.5 to 1 times the diameter of the housing (1);

the wall thickness of the reducing section (7) is 5-15 mm;

the aperture of the cooling hole (51) is 1 mm-2.5 mm.

8. The burner according to claim 1, characterized in that a plurality of arc mouth support plates (9) are arranged circumferentially between the flared end of the mouth cone section (8) and the inner wall of the housing (1), the mouth support plates (9) and the mouth cone section (8) and the housing (1) being welded to each other;

a support rod (10) is arranged between the central combustion chamber (6) and the shell (1), and the support rod (10) is welded with the central combustion chamber (6) and the shell (1); the mouth supporting plate (9) and the supporting rod (10) are used for fixing the integral structure formed by the expansion section (5), the central combustion chamber (6), the reducing section (7) and the mouth conical section (8) inside the shell (1).

9. An alcohol-based low-nitrogen combustion device comprises an air supply system (100), a fuel supply system (200) arranged at an air inlet of the air supply system (100), and a program controller (300) for controlling the air supply system (100) and the fuel supply system (200); the air supply system is characterized by further comprising a combustion head (400) as claimed in any one of claims 1 to 8, wherein the shell connecting end of the combustion head (400) is in sealed communication with the air outlet of the air supply system (100) through a reducing pipe (500).

10. The alcohol-based low-nitrogen combustion device as claimed in claim 9, wherein both ends of the reducing pipe (500) are respectively in detachable sealing communication with the shell connecting end of the combustion head (400) and the air outlet of the air supply system (100) through flanges;

an ignition electrode is arranged on the electrode mounting hole (52) of the expansion section (5);

an ultraviolet fire detector is arranged at the joint of the reducing pipeline (500) and the air outlet of the air supply system (100);

the fuel connector (23) is in sealed communication with a fuel supply system (200).

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